<template>
  <header class="header">
    <h1>todos</h1>
    <input v-model="isAll" id="toggle-all" class="toggle-all" type="checkbox" >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model.trim="txt"
      @keydown.enter="enterDown"
    />
  </header>
</template>

<script>
export default {
    props:['list'],
    data() {
      return {
        txt: ''
      }
    },
    methods: {
      enterDown() {
        if(this.txt.length == 0) return alert('内容不能为空')
        this.$emit('addTask',this.txt)
        this.txt = ''
      }
    },
    computed: {
      isAll: {
        set(val) {
          this.list.forEach(item => item.isDone = val)
        },
        get() {
          if(this.list.length === 0) return false
          return this.list.every(item => item.isDone)
        }
      }
    }
}
</script>